NETWORK OF AQUACULTURE CENTRES IN ASIA
December 1988
 | NACA/WP/88/66 PRELIMINARY STUDIES ON THE ANALYSIS OF Guo Xianzhen, Fang Yingxue, Wang Jikun and Pang XiuzhenBACTERIAL TYPES IN THE FISH PONDS APPLIED WITH FOUR KIND OF ANIMAL MANURE AND THE EFFECTS OF MANURING ON THE ECOSYSTEM & YIELD |
Freshwater Fisheries Research Centre of
Chinese Academy of Fishery Sciences
Asian-Pacific Regional Research & Training
Centre for Integrated Fish Farming
NACA Head Office
National Inland Fisheries Institute
Kasetsart University Campus
Bangkhen, Bangkok
Thailand
Cable NACARK BANGKOK 10900
The studies consisted of a continuous determination of the composition and change of aquatic bacteria and related ecological factors in the fish ponds applied with four kinds of manure of chicken, duck, pig and cattle, and the analysis of results using mathematical statistics and a mini-computer. The study shows that aquatic bacteria have very close relationship with many ecological factors in the fish pond such as dissolved oxygen, BOD, suspended substance, organic detritus, transparency, nutrient salts and plankton, which either shows direct or indirect ratio, and often play a decisive role in their existence and growth. It is thus obvious that the aquatic microorganisms have a very strong influence on the pond ecosystem. At the same time, aquatic bacteria, as the material decomposers and important natural feed for fishes, also directly or indirectly join the formation of autotrophic and heterotrophic food chains; it, in turn, affects the growth and yield of fish. Our studies also verify this through the analysis of the relationship between bacteria and fish yield and the determination of actual farming results of the fishes.
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